Lighting assembly

Abstract

In one example, a lighting assembly includes a housing to hold an elongated lamp and an elongated device attached to or integral with the housing and configured to, when an lamp is held in the housing, convert light from the lamp having a first irradiance that is non-uniform along a length into light having a second irradiance that is uniform along the length.

The invention claimed is: 
     
       1. An additive manufacturing machine that includes a lighting assembly comprising a carriage movable over a work area and carrying:
 a first lamp having a first color temperature to irradiate build material in the work area as the carriage moves over the work area; 
 a second lamp having a second color temperature greater than the first color temperature to irradiate build material in the work area as the carriage moves over the work area; and 
 a baffle having an opening under the first lamp to pass a first amount of light emitted from the first lamp along an inner part of the work area and to pass a second amount of light greater than the first amount emitted from the first lamp along an outer part of the work area. 
 
     
     
       2. The machine of  claim 1 , where the lighting assembly comprises a reflector covering the first lamp opposite the baffle to reflect light emitted by the first lamp toward the baffle. 
     
     
       3. The machine of  claim 2 , where the baffle forms a dumbbell shaped opening such that the first, greater amount of light passes through the ends of the opening and the second, lesser amount of light passes through the middle of the opening. 
     
     
       4. The machine of  claim 3 , where:
 the first lamp comprises a single first lamp with a color temperature of 800K to 2150K; and 
 the second lamp comprises multiple second lamps each with a color temperature of 2400K to 3500K. 
 
     
     
       5. The machine of  claim 1 , where the carriage carrying the lamps is a first carriage and the machine includes a second carriage movable over the work area and carrying a dispenser to dispense a liquid fusing agent as the second carriage moves over the work area. 
     
     
       6. The machine of  claim 5 , where the first carriage carries a layering device to layer build material over the work area as the first carriage moves over the work area. 
     
     
       7. A lighting assembly for an additive manufacturing machine that includes a work area to support or contain build material for fusing, the lighting assembly comprising:
 a warming lamp to irradiate build material in the work area as the warming lamp is moved over the work area; 
 a fusing lamp to irradiate build material in the work area as the fusing lamp is moved over the work area; and 
 a baffle having a dumbbell shaped opening therein near the warming lamp such that a first, greater amount of light emitted from the warming lamp passes through each end of the opening and a second, lesser amount of light emitted from the warming lamp passes through a middle part of the opening between the ends. 
 
     
     
       8. The assembly of  claim 7 , where:
 the warming lamp is a single warming lamp; and 
 the fusing lamp comprises multiple fusing lamps. 
 
     
     
       9. The assembly of  claim 7 , where the warming lamp has a first color temperature and the fusing lamp has a second color temperature greater than the first color temperature. 
     
     
       10. The assembly of  claim 7 , where the warming lamp and the fusing lamp are movable together over the work area. 
     
     
       11. The assembly of  claim 10 , comprising a single carriage carrying the warming lamp and the fusing lamp.